Originally Posted by old roper
The OP is talking about custom barrel and most like Kreiger/Bartlein etc will not warranty any lapping of their barrels.
No doubt that's true. Once you start modifying any firearm or component to improve accuracy you risk that. Most of us do it anyway, but it should be done with full understanding that you are most likely putting yourself on your own once you undertake to do it. Some of the gun makers don't void the warranty, but will put any changes you made back to factory spec before returning the gun to you, should you send it in for some reason.